Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China.
State Key Laboratory of Livestock and Poultry Breeding, Guangzhou 510640, China.
Poult Sci. 2017 Jul 1;96(7):2336-2343. doi: 10.3382/ps/pex032.
The aim of this study was to evaluate the effect of zinc supplementation on productive performance and antioxidant status in laying ducks. Five-hundred-four laying ducks were divided into 7 treatments, each containing 6 replicates of 12 ducks. The ducks were caged individually and fed a corn-soybean meal and wheat bran basal diet (37 mg Zn/kg) or the basal diet supplemented with 15, 30, 45, 60, 75, or 90 mg Zn/kg (as zinc sulfate). During the early laying period of 10 d (daily egg production <80%), egg production, daily egg mass, and FCR increased quadratically with increasing dietary Zn levels (P < 0.05). The highest egg production and daily egg weight were obtained when 30 or 45 mg Zn/kg diet was supplemented, with lowest FCR. Similarly, the highest egg production and daily egg mass were observed in the group supplemented with 30 or 45 mg Zn/kg during the peak laying period of the subsequent 120 d (daily egg production >80%). Average egg weight and feed intake did not differ among the groups of graded Zn supplementation.The egg quality was not affected by dietary Zn, including the egg shape index, Haugh unit, yolk color score, egg composition, and shell thickness. The activities of plasma activities of total superoxide dismutase (T-SOD) and glutathione peroxidase (GSH-PX) increased in a quadratic manner (P < 0.001) with increasing supplemental Zn. Plasma concentration of Zn increased quadratically (P < 0.05) as dietary Zn increased. The hepatic activity of Cu/Zn-SOD and GSH-PX increased quadratically (P < 0.05) with increasing dietary Zn. Plasma Zn concentrations were positively correlated with activities of T-SOD (P < 0.05), and positively with plasma Cu. Plasma concentration of reduced glutathione was correlated with plasma Cu. In conclusion, supplementation of Zn at 30 or 45 mg/kg to a corn-wheat bran and soybean basal diet may improve the productive performance and enhance the antioxidant capacity.
本研究旨在评估补锌对产蛋鸭生产性能和抗氧化状态的影响。将 504 只产蛋鸭分为 7 个处理组，每个处理组包含 6 个重复，每个重复 12 只鸭。鸭单独饲养，饲喂玉米-豆粕-麦麸基础日粮（37mg Zn/kg）或基础日粮添加 15、30、45、60、75 和 90mg Zn/kg（硫酸锌）。在 10d 的产蛋早期（日产蛋率<80%），随着日粮锌水平的增加，产蛋率、日蛋重和饲料转化率呈二次曲线增加（P<0.05）。当饲料中添加 30 或 45mg Zn/kg 时，产蛋率和日蛋重最高，饲料转化率最低。同样，在随后的 120d 的产蛋高峰期（日产蛋率>80%），添加 30 或 45mg Zn/kg 日粮的组产蛋率和日蛋重最高。不同梯度锌添加组的蛋重和采食量没有差异。蛋品质不受日粮锌的影响，包括蛋形指数、哈夫单位、蛋黄颜色评分、蛋成分和蛋壳厚度。血浆总超氧化物歧化酶（T-SOD）和谷胱甘肽过氧化物酶（GSH-PX）活性呈二次曲线增加（P<0.001），随着补充锌的增加而增加。随着日粮锌的增加，血浆锌浓度呈二次曲线增加（P<0.05）。肝脏 Cu/Zn-SOD 和 GSH-PX 活性随日粮锌的增加呈二次曲线增加（P<0.05）。血浆锌浓度与 T-SOD 活性呈正相关（P<0.05），与血浆铜呈正相关。血浆还原型谷胱甘肽与血浆铜呈正相关。总之，在玉米-麦麸和豆粕基础日粮中添加 30 或 45mg/kg 的锌可以提高生产性能，增强抗氧化能力。
